Renable WebViewTest.GeolocationAPIEmbedderHasAccessMultipleBridgeIdAllow with fixes.

Renable WebViewTest.GeolocationAPIEmbedderHasAccessMultipleBridgeIdAllow with fixes.

This broke because of https://src.chromium.org/viewvc/blink?view=rev&revision=175404. There were two problems:
-GeolocationProviderImpl::OnClientsChanged() was incorrectly resetting position_ even when it was overridden for testing. We didn't notice this before because the blink-side geolocation controller would cache the last position and it would reuse it for the iframe. now that each frame goes to the browser, it became apparent
-the test iframe html needed to be non-zero for the same reason as above (now we need to go to the browser for the iframe)

BUG=304341
R=lazyboy@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275157

[lazyboy, 2014-06-05 01:52:14]

lgtm

[jam, 2014-06-05 04:08:30]

The CQ bit was checked by jam@chromium.org

[commit-bot: I haz the power, 2014-06-05 04:09:49]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jam@chromium.org/311193006/1

[commit-bot: I haz the power, 2014-06-05 06:58:02]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_chromium_gn_compile_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_chromium_gn_c...)

[commit-bot: I haz the power, 2014-06-05 07:02:28]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-05 07:02:28]

Try jobs failed on following builders:
  android_chromium_gn_compile_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_chromium_gn_c...)